Heat oven to 350°F. Grease and flour three 9-inch round baking pans.Stir together sugar, flour, cocoa, baking powder, baking soda and salt in large bowl. Add eggs, milk, oil and vanilla; beat on medium speed of mixer 2 minutes. Stir in boiling water (batter will be thin). Pour batter into prepared pans.Bake 30 to 35 minutes
Frosting
Beat butter and shortening. Add powdered sugar, salt, and heavy cream and beat again. Add food gel and lavender. Frost the cake layers, then frost the whole cake. Decorate with flowers.